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Galaxy S23 Ultra 5G, S918U1 and S918U, 256 and 512GB: what to check before buying a used US-version unit
A Galaxy S23 Ultra 5G offered in the used and refurbished category, listed in the S918U1 and S918U variants with 6.8-inch display and 256 or 512GB of storage and 8 or 12GB of RAM, Snapdragon chipset and NFC. Those model codes are the first thing worth acting on: the trailing letter tells you which market the handset was built for, and that in turn decides which carrier bands it will pick up where you live, so confirm the exact variant you are being sent. Storage and RAM choices appear in the same listing, so pick the combination you actually need rather than the cheapest line. Because this is a refurbished unit rather than a sealed one, condition grade, what comes in the box and what warranty applies are seller-specific, and the honest answer is that only the seller can tell you. Ask before you pay, and treat the photos as indicative of appearance.